var gulp = require('gulp');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify-es').default;
var rename = require('gulp-rename');
var inject = require('gulp-inject-string');

var config = {
    jsPath: './app',
    jsApps: [
        "tt-copyright",
        "tt-collapse",
        "add-clipboard-to-element"
    ],
};

initGulpTaskPerApp();

function initGulpTaskPerApp(){
    let jsPathsAllApps = [];
    config.jsApps.forEach(function(app){
        let appDir = config.jsPath + "/"+app;
        let jsPathsApp = getJsPathsForApp(app);
        jsPathsAllApps = jsPathsAllApps.concat(jsPathsApp);

        gulp.task('concat '+app+' js', function(done) {
            getGulpSrc(jsPathsApp, appDir, false);
            done();
        });

        gulp.task('minify '+app+' js', function(done) {
            getGulpSrc(jsPathsApp, appDir, true);
            done();
        });

        //Watch Task for Minify JS
        gulp.task('watch '+app+' minify', function() {
            gulp.watch(jsPathsApp).on("change",gulp.series('minify '+app+' js'));
        });
    });

    const concatSeries = minifyAllApps("concat");
    gulp.task('concat all', concatSeries);

    const minifySeries = minifyAllApps("minify");
    gulp.task('minify all', minifySeries);

    gulp.task('watch concat all', function() {
        gulp.watch(jsPathsAllApps).on("change",gulp.series('concat all'));
    });

    gulp.task('watch minify all', function() {
        gulp.watch(jsPathsAllApps).on("change", gulp.series('minify all'));
    });
}

function minifyAllApps(minify = "minify"){
    let gulpSeries = [];
    config.jsApps.forEach(function(app){
        gulpSeries.push(minify+' '+app+' js');
        //gulp.series('concat '+app+' js');
    });
    return gulp.series(gulpSeries);
}
function getJsPathsForApp(app){
    let appPath = config.jsPath + "/"+app;

    //Path to all relevant js files for all.min.js
    //Includes jquery first
    return [ //config.jsPath + '/lib/jquery.min.js',   //jQuery Core
        appPath + '/lib{,/**}/*.js',      //Include own libs
        appPath + '/*.js',                //Include js in js-root
        '!' + appPath + '/extra/**',      //Exclude "extra" files
        '!' + appPath + '/all.min.js',    //Exclude all.min.js itself
        '!' + appPath + '/all.js'];       //Exclude all.js itself
}

function getGulpSrc(jsPaths, appDir, minify = false) {
    let gulpSrc = gulp.src(jsPaths)
        .pipe(concat('all.js'))
        //.pipe(inject.before("jQuery(document).ready",getInjectJSString()))
        .pipe(gulp.dest(appDir))
        .pipe(rename('all.min.js'));

    if(minify)
        gulpSrc.pipe(uglify())

    gulpSrc.pipe(gulp.dest(appDir));
    return gulpSrc;
}

function getInjectJSString(){
    var date = new Date();
    var ret = "";
    ret += "//Generated by Gulp (PIC): Timestring of Generation \r\n";
    ret += "pic_globals.generated = \"" + date.toISOString() + "\";";
    ret += "\r\n";
    ret += "//End: Generated by Gulp";
    ret += "\r\n";
    return ret;
}